import numpy as np
import matplotlib.pyplot as plot
import pandas as pd

filename = "iris.csv"
iris = pd.read_csv(filename)
print(np.corrcoef(iris.sepal_length,iris.sepal_width))
color_list=['blue']*50+['red']*50+['grey']*50
plot.scatter(iris.sepal_length,iris.sepal_width,color=color_list)
plot.show()